Dredger



(No Model.) 2 Sheets-Sheet 1. A. F. CARROLL.

DRBDGER.

No. 541,223. Patented June 18, 1895.

I I 1.111111 l 111 1111111? 1 1 1 1 1 rf W 11l 1 1 .il 111,11 I111 (No Model.) 2 sheets-sheet 2. A. F. CARROLL.

DRBDGBR,

1&1 A 22:1.12 11i No. 541,223. Patented June'18, 1895.

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UNITED STATES PATENT OFFICE.

ANTHONY F. CARROLL, OF PORTLAND, OREGON.

DREDGER.

VGPECIFICGATION forming part of Letters Patent No. 541,223, dated June 18, 1 895.

`Applioatdm filed February 28, 1895. Serial No. 540,102. (No model.)

gal pump being employed to cause the water and soil to pass through the pipe to the du mp.

My invention aims to separate Wood, stones, and other large matter from the soil, and to permit only small and light substances to pass into the discharge spout, thereby obviating injury and choking up of the conveyers.

The primary object of the invention is to 'prevent back pressure in the feed, or supply pipe, and to supplement the action of the pump in'forcing the Water and soil through the discharge pipe. This back pressure has been found to give considerable annoyance, and detract from the usefulness of dredges of this type, as heretofore constructed, and is wholly obviated by the present invention.

The improvement consists of the novel features and the peculiar construction and combination of the parts which hereinafter will be more fully described and claimed, and which are shown in the accompanying draw-y ings, in Which- Figure 1 is a central longitudinal section of a iioat or scow upon which the operating parts are mounted. Fig. 2 is a plan view, in detail, of the receptacle or hopper for receiving the excavated soil and the side deliverychute for conveying away the large and bulky matter. Fig. 3 is a detail view, on a larger scale, of the feed-pipe, the propeller operating in the chamber thereof, the inner end of the discharge-pipe, and the centrifngalpump.

The excavator 2 is located at one end of the oat A, and is manipulated in any of the usual ways, both with regard to the manner of its operation, and with respect to regulating the depth to which the excavating is to be performed. A receptacle, or hopper, 3 is located at the delivery end of the excavator to receive the excavated soil. The upper end of this receptacle is closed by a screen et which separates stones, Wood and other large matter which would be likely-to Work injury to and V,choke the operating parts of the discharge mechanism. The bottom of the receptacle, or hopper, 3 inclines in opposite directions, and a supply or feed pipe 5 communicates with the lower portion thereof so as to convey the soil intoa horizontal compartment 6 which terminates at one end in a discharge nozzle 7. The discharge spout, or pipe, 9 is provided at its receiving end with an enlarged or daring section Sinto which the discharge spout 7 and the pipe 10, leading from the centrifugal pump l1, extend. passes across the end of the discharge spout 7 to cause the water, discharged therefrom into the enlarged section 8, to create a suction, after the fashion of a tuyere, through the said discharge spout 7 to draw the soil and waterV therefrom, and cause it to pass through the discharge pipe 9.

A propeller-wheel 12 is located in the compartment 6, and is driven at a sufficiently high rate of speed to materially assist and cause the passage of the soil through the feed pipe 5, the y discharge spout 7, into the receiving or enlarged section 8 of the discharge pipe 9. A suitable valve 13 is located inthe feed pipe 5, at a point between the propeller-wheel l2 and the receptacle 3, to be operated to shut off the supply of matter to the compartment 6 in the event of the propellerwheel 12, or the discharge pipe 9, choking.

From the foregoingit will be seen that the chief purpose of the propeller-wheel 12 is to assist the action of the pump 11 in forcing the soil through the discharge spout 7 into the pipe 9. It is obvious that if the propeller-wheel 12 should be dispensed with, or should be of such construction as to serve as an agitator of Crusher, the pressure of the pump 11 would be sufficient, at times, to cause a back action, and result in a dow of the water through the spout 7 and pipe 5 instead of, in the desired direction, through the pipe 9. Particularly would this action result if the column of water should be retarded in its passage through the pipe 9 from any cause, or if the latter should become choked. Hence, it will be seen that the propeller-Wheel 12 is The end of the pipe 10 IDO ofvital importance and forms the leading feature of the present invention.

The centrifugal pump, as also the propeller-wheel 12, will be operated by suitable gearing from the engine 14. The Water entering through the suction pipe is discharged through the pipe 10 into the pipe 9, and the soil delivered into the receptacle 3 passes by Way 0f the feed pipe 5, compartment 6 and i discharge spout 7 into the said pipe 9 and is conveyed by the flow of the Water to the desired point of discharge. The Wood, large stones and other matter too large 'to pass through the meshes of the screen 4,gravitate down the same and are received into a lateral chute 16, Which delivers them into a barge or scow lashed alongside of the oat A.

Iu the disposition and arrangement of the parts l2 and 13, changes in the form, proportion, and the minor details of construction may be resorted to Without departing from the principle or sacrificing any of the advantages of this invention.

Having thus described my invention, what I claim is- 1. In a dredge, the combination of a compartment having a discharge nozzle anda feed pipe, a propeller wheel-operating `in the said compartment between the feed pipe and the discharge nozzle to cause a positive 1n0v=ement through the said compartment of the excavated soil, a discharge pipe for conveying the excavated soil to a convenient point of deposit, and having its receiving end com-l municating with the aforementioned compartment, and a blast pipe communicating; with the discharge pipe, substantially Vas vset t forth for the purpose described.

2. In a dredge, th'e combination of `an approximately horizontal compartment provided at one end with a vertically-disposed@ discharge nozzle and at its opposite end with i the presence of two witnesses.

a supply or feed pipe, a .propeller wheel operating in the said compartment to cause a positive movement therethrough of the excavated soil, a discharge pipe for conveying the excavated soil to a convenient point of deposit, and having its receiving end enlarged and commnnicatingwiththe aforementioned compartment, and a blast pipe having its delivery end extending into the receiving or en` larged end of the discharge pipe and projecting across the delivery end of the said discharge nozzel, substantially as set forth for the purpose described. 3. In a dredging apparatus, the combination of an excavator, a receptacle for-receiving the excavated soil, a separating screen interposed l between the excavator and the raceptacle for removing large and bulky 'matter and delivering the same into a chute, a feed pipe leading from the receptacle-and provided near its lower end portion with a compartment and discharge spout, a controlling valve located' in tfhe 'feed pipe, a propeller-wheel arranged in t'h-'e said compartment to cause a lpositive 'movement of the excavated soil through the said feed pipe and disch-arge spout, a discharge pipe having an enlarged section `at its receivingv end into which the said discharge spout extends, and va centrifugal pump having its delivery pipe projected into the re@ ceiving section of the discharge pipe and exten-ding across the jdelivery en'dlof the said 'discharge spout, substantially as and for the purpose set forth.

zIn testimony that I claim the foregoing as my own I have hereto affixed my signature in ANTHONY CARROLL.

Wi tn esses:

T. G. THORNTON, JAMEs GLEAsoN 

